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为探索水平地震作用下恒压受弯无筋砌体承重墙的受弯力学性能,研究了正截面在不同阶段弹塑性受弯能力的历经过程。基于砌体正截面非均匀应力的本构关系假定及拉压区应力图形的等效化,对不同初裂情况下各阶段的恒压受弯能力计算公式作了理论推导,并进行了编程计算分析。结果表明:砌体墙在通常轴压比下,正截面边缘首先拉裂,之后受弯能力不会退化而是逐渐增大;达到极限受弯承载力后,截面产生压碎,受弯能力退化呈直线下降型;弯曲拉裂是从截面局部开始和发展的,受弯能力呈现类似配筋混凝土墙柱的延性,拉裂和压碎的开展过程随轴压比的增大而缩短。砌体墙在高轴压比下,正截面首先压碎,随后受弯能力持续下降。
In order to explore the mechanics of flexural behavior of load-bearing walls of constant pressure reinforced (RC) -based masonry walls under horizontal earthquake, the elasto-plastic bending behavior of normal section at different stages was studied. Based on the assumption of constitutive relationship of non-uniform stress in normal section of masonry and the equivalent stress-strain graph in tension-compression zone, the formula of constant-pressure bending capacity under different initial cracking conditions is theoretically deduced and programmed. analysis. The results show that the masonry wall at the normal axial compression ratio first fractures the normal cross-section edge, and then the flexural capacity does not degenerate but gradually increases. When the ultimate flexural capacity is reached, the cross-section is crushed and the bending capacity degenerates Which is a linear descending type. The bending fracture begins and develops locally from the cross section. The flexural capacity shows ductility similar to that of the reinforced concrete wall columns. The development of the fracturing and crushing shortens with the increase of the axial compression ratio. At high axial compression ratio, masonry walls first crush the normal cross-section and then continue to decline in bending capacity.