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Natural hydraulic lime (NHL) mortars are widely used for restoration works due to their good compatibility with the substrate material in terms of physical, chemical, and mechanical properties. Regarding their mechanical characterization, there is still a need for further understanding of their fracture behavior and the influence of their dosage methodology on the mechanical properties. Thus, this chapter focuses on the mechanical characterization of NHL mortars, such as flexural, compressive, and splitting tensile strengths, elastic modulus, and fracture energy. Moreover, the influence of the composition and production process on such properties was studied as well. Furthermore, the loading rate effect on the fracture behavior was also presented. The results show that NHL mortars have shape and size effect on the compressive strength. In addition, NHL mortar is rate sensitive, mainly due to the viscous effects caused by the presence of free water in the porous structure.

The mechanical model analysis of the rigid joint of the key beam column connection of the portal frame of the industrial building is given in this paper.The structure form of joint has great influence on the stress state of high strength bolt connection.The calculation model of bolt is matched according to the actual structure. The mechanical analysis of the components joint using the finite element software SAP2000 is given by choosening the model of rigid stiffener extended end plate connection.The results show that the tension value of the two row of bolts on the side of the rigid joint model is close to each other.The tension of the first row of bolts on the side of the tension flange is always in the extreme value, which could be considered for the design envelope value.There is no obvious change in the tension force of the flange side of the compression flange if ignoring the impaction of the pull bending force,which satisfies the plane section assumption.The numerical simulation results verify the applicability of the proposed model for the design of high strength bolt rigid joints.