Strength Prediction of Mass-Timber Panel Concrete-Composite Connection with Inclined Screws and a Gap

Mirdad, Abdul Hamid; Chui, Ying Hei

doi:10.1061/(asce)st.1943-541x.0002678

Cited by 16 publications

(15 citation statements)

References 9 publications

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“…e connector was fully threaded self-tapping screw of 11 mm diameter with a 45°insertion angle to timber grain and 100 mm penetration length. e connection stiffness and strength were calculated based on [24,25], respectively, and are presented in Table 2. As required by the National Building Code of Canada (NBCC) [37], the appropriate load combinations were considered.…”

Section: Deflectionmentioning

confidence: 99%

“…As the structural integrity of the TCC system primarily depends on interlayer mechanical connectors, analytical models have also been developed for directly calculating the 2 Advances in Civil Engineering strength [24] and stiffness [25] of concrete-to-timber connection based on the component properties. ese connection models allow the timber-concrete connection properties, which are required for TCC system design, to be calculated without the need to perform connection tests.…”

Section: Introductionmentioning

confidence: 99%

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Sustainability Design Considerations for Timber‐Concrete Composite Floor Systems

Mirdad

Daneshvar

Joyce

et al. 2021

Advances in Civil Engineering

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Over the last few decades, there has been growing interest in the use of low-carbon materials to reduce the environmental impacts of the construction industry. The advent of mass timber panels (MTP), such as cross laminated timber (CLT), has allowed structural engineers to specify a low-carbon material for a variety of floor design considerations. However, serviceability issues such as vibration and deflection are limiting the construction of longer span timber-only floor systems and have encouraged the development of timber-concrete composite (TCC) systems. The use of concrete would negatively impact on the carbon footprint of the TCC floor system and should be minimized. The purpose of this study was to study the impact on embodied carbon in the TCC system, when the ratio of timber and concrete was varied for specific floor spans. Two MTP products were considered, CLT and glued laminated timber (GLT). The floors were designed to satisfy structural, acoustic, and vibration criteria, and the results were presented in the form of span tables. It was found that using thicker MTP instead of adding concrete thickness to meet a specific span requirement can lead to lower embodied carbon values. Increasing concrete thickness for long-span floor systems led to a reduction in allowable floor span due to the vibration criterion being the controlling design parameter. Increasing timber thickness also resulted in higher strength and stiffness to weight ratios, which would contribute toward reducing the size of lateral load resisting systems and foundations, resulting in further reductions in the embodied carbon of the entire structure.

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Section: Deflectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sustainability Design Considerations for Timber‐Concrete Composite Floor Systems

Mirdad

Daneshvar

Joyce

et al. 2021

Advances in Civil Engineering

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“…In general, due to their positive constructional characteristics, wood-concrete-composite systems (HBV) can be used in many ways in the construction sector for modular buildings using prefabricated elements. Especially for ceiling systems, the construction method of combining cassette systems with wood-concrete composites achieves excellent loadbearing (an increase by up to 400% compared to original wooden ceilings is achieved through the hybrid ceiling system) and represents an alternative to conventional construction methods [41][42][43][44][45][46]. Moreover, the stiffness, as well as the sound insulation and vibration characteristics of the assessed material, are also improved compared to the traditional wooden ceiling.…”

Section: Definition Of the Case Studymentioning

confidence: 99%

Integrating Regionalized Socioeconomic Considerations onto Life Cycle Assessment for Evaluating Bioeconomy Value Chains: A Case Study on Hybrid Wood–Concrete Ceiling Elements

2021

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As bioeconomy strategies strive to integrate industrial sectors for achieving innovative materials alternative to the ones produced from non-renewable resources, the development of monitoring systems and tools to assess the implementation of such value chains is still a work in progress. This work intended to integrate the traditional life cycle assessment with a regionalized social life cycle assessment method to evaluate alternative production scenarios of a hybrid construction system with a wood-based lightweight concrete panel as a core component currently in its final stages of technical development. The life cycle impact assessment was carried out by comparing the relative advantages of two product development scenarios against the reference system’s results. The social life cycle assessment was carried out using the model “REgional SPecific cONtextualised Social life cycle Assessment” (RESPONSA), which was developed for assessing wood-based value chains under a regional scope. The results showed that both alternative scenarios present large advantages when compared to the reference system. Moreover, the implementation of the production value chain was found to imply positive socioeconomic advantages in the region, in particular, due to the quality of the jobs found in the organizations associated with the production system.

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“…There have been several experimental and theoretical studies of STS connections in timber-to-timber [12][13][14][15][16][17][18], steel-to-timber [17,[19][20][21], and concrete-totimber [22][23][24][25] systems, which have concluded that installing the screw at an angle (e.g., 45° or 30°) to the surface of the timber member increases the strength and stiffness significantly. For concrete-to-timber STS connections, it was experimentally [7], and later analytically [26,27], proven that there is a significant increase in strength and stiffness of the connection when the screws are inserted at a 30° angle to the timber member surface compared to a 45° angle.…”

Section: Introductionmentioning

confidence: 99%

“…Because there is currently no method for evaluating inclined connector properties, tests are frequently conducted using standardized procedures such as EN 26891:1991 to characterize the strength and stiffness of the connectors [29]. To circumvent the requirement for testing, analytical models for predicting connection strength [26] and stiffness [27] have been developed for dowel-type connectors inserted at any angle to the face of the member. Inputs into these models are the component properties such as embedment and withdrawal strength and stiffness of the connector in wood, bending yield moment and stiffness of the connector, and friction coefficient at the timber-concrete interface.…”

Section: Introductionmentioning

confidence: 99%

Analytical Procedure for Timber−Concrete Composite (TCC) System with Mechanical Connectors

2022

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In the construction of modern multi-storey mass timber structures, a composite floor system commonly specified by structural engineers is the timber–concrete composite (TCC) system, where a mass timber beam or mass timber panel (MTP) is connected to a concrete slab with mechanical connectors. The design of TCC floor systems has not been addressed in timber design standards due to a lack of suitable analytical models for predicting the serviceability and safety performance of these systems. Moreover, the interlayer connection properties have a large influence on the structural performance of a TCC system. These connection properties are often generated by testing. In this paper, an analytical approach for designing a TCC floor system is proposed that incorporates connection models to predict connection properties from basic connection component properties such as embedment and withdrawal strength/stiffness of the connector, thereby circumventing the need to perform connection tests. The analytical approach leads to the calculation of effective bending stiffness, forces in the connectors, and extreme stresses in concrete and timber of the TCC system, and can be used in design to evaluate allowable floor spans under specific design loads and criteria. An extensive parametric analysis was also conducted following the analytical procedure to investigate the TCC connection and system behaviour. It was observed that the screw spacing and timber thickness remain the most important parameters which significantly influence the TCC system behaviour.

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Strength Prediction of Mass-Timber Panel Concrete-Composite Connection with Inclined Screws and a Gap

Cited by 16 publications

References 9 publications

Sustainability Design Considerations for Timber‐Concrete Composite Floor Systems

Sustainability Design Considerations for Timber‐Concrete Composite Floor Systems

Integrating Regionalized Socioeconomic Considerations onto Life Cycle Assessment for Evaluating Bioeconomy Value Chains: A Case Study on Hybrid Wood–Concrete Ceiling Elements

Analytical Procedure for Timber−Concrete Composite (TCC) System with Mechanical Connectors

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